The exact cause of bladder cancer is unknown. It occurs when abnormal cells grow and multiply quickly and uncontrollably, and invade other tissues. Smoking increases your risk of bladder cancer. Smoking causes half of all bladder cancers in men and women. The following factors also increase your risk of developing bladder cancer: exposure to cancer-causing chemicals at work.
Oil and natural gas are produced by the same geological process according fossil fuel suggestion: anaerobic decay of organic matter deep under the Earth's surface. As a consequence, oil and natural gas are often found together.In common usage, deposits rich in oil are known as oil fields, and deposits rich in natural gas are called natural gas fields.n general, organic sediments buried in depths of 1,000 m to 6,000 m (at temperatures of 60 Â° C to 150 Â°C) generate oil, while sediments buried deeper and at higher temperatures generate natural gas. The deeper the source, the drier the gas (that is, the smaller the proportion of condensates in the gas).
Natural gas. Natural gas, colourless, highly flammable gaseous hydrocarbon consisting primarily of methane and ethane. It is a type of petroleum that commonly occurs in association with crude oil. Natural gas is often found dissolved in oil at the high pressures existing in a reservoir, and it can be present as a gas cap above the oil. In many instances it is the pressure of natural gas exerted upon the subterranean oil reservoir that provides the drive to force oil up to the surface.